@@bandofbros8112most are 1,200, a few I’ve seen are 1,800. I did watch another review that said this tent was 2,500 however. I’m not certain which number is accurate. Perhaps they changed it.
Hydrostatic head is almost a meaningless measurement. When are you going to have a column of water in a very concentrated space sitting on top of any tent? The weather doesn't work like that 😬